Bus Service 21

Service 21 File:SBS3227U 21.jpeg
Route Information
Route	Pasir Ris Interchange ↔ St. Michael's Terminal
Route Length	27.4 km (towards St. Michael's) 25.0 km (towards Pasir Ris)
Travelling Time	130 mins (2 h 10 mins)
Operator	(Bishan – Toa Payoh Bus Package)

Bus Service 21 spans from Central to East, serving many residential areas throughout its route, such as Whampoa, Balestier, Boon Keng, Kallang, Paya Lebar, Eunos, Kaki Bukit, Bedok Reservoir, Tampines and Pasir Ris. Its lengthy route and large coverage makes it an important inter-town route, and as a result, journey time is relatively long for its length.

Introduced in 1992, the route originally ran between Pasir Ris Int and Lorong 1 Geylang Ter before being extended to St. Michael’s in 1993 following the merger with then-Service 4. Service 21 made history on 26 June 2006 as the first wheelchair-accessible bus service in Singapore following the debut of Volvo B9TL (CDGE) buses on the route.

The route has several key sectors offering important connections, such as that between St. Michael’s Estate and Novena MRT, Farrer Park and the Geylang district, as well as that between Eunos MRT and Bedok Reservoir Road. As such, in addition to demand from inter-town connections, the route experiences high demand throughout the day, and relies on fleet comprising mostly of double-decker buses. Around Farrer Park, the route plies very different stretches in either direction. The route was amended to serve Jalan Tenteram in both directions in April 2016.

Service 21 uses coloured information plates.

21

(towards Pasir Ris Interchange)

21

(towards Saint Michael's Terminal)

Short-Trip Service 21A operates only on Sundays and Public Holidays, and supplements the high demand for Service 21 from the Geylang area to Kitchener Road near Little India.

Service Information

Bus Duty & Fleet

Service 21/21A

Depot	Fleet Size		Fleet
	21	21A
Ang Mo Kio Depot (AMDEP)	29 Ang Mo Kio: 21 Bedok North: 8	4	10 Single Deckers	11 Double Deckers
			SBS6014Y SBS6624L Mercedes-Benz O530 Citaro SBS5023C SBS5109P SBS8280G SBS8287M SBS8289H SBS8816L SBS8823R SBS8830U Scania K230UB	SG6222A SG6223Y SG6233T SG6261L MAN ND323F SBS3158K SBS3186DA SBS3847E SBS3904Z SG5116E SG5118A Volvo B9TL
Bedok North Depot (BNDEP)		N/A	5 Single Deckers	3 Double Deckers
			SBS8179S SBS8230B SBS8532E SBS8662M SBS8667A Scania K230UB	SBS3013U SBS7668D SG5023P Volvo B9TL

Notes

1 missing AMDEP DD. Several random BNDEP DDs will operate on Service 21 on Weekends & Public Holidays. Several random AMDEP DDs will operate on Service 21 on Sundays & Public Holidays. Full DD fleet for BNDEP on Weekends & Public Holidays. Majority DD fleet for AMDEP on Sundays & Public Holidays. Weekdays: Ang Mo Kio 12A-12P / 7S / 2T; Bedok North 7A-6P / 1S (29 buses) Saturdays: Ang Mo Kio 12A-15P / 1T; Bedok North 7A-7P (23 buses) Sundays & Public Holidays: Ang Mo Kio 8A-10P / 2S / 6T; Bedok North 6A-7P (25 buses) Special Weekdays: Ang Mo Kio 12A-12P / 3E / 4S; Bedok North 6A-6P / 1E / 1T (28 buses) Special Saturdays: Ang Mo Kio 11A-13P / 2T; Bedok North 7A-8P (24 buses) Special Sundays: Ang Mo Kio 9A-11P / 3S / 3T; Bedok North 6A-7P (25 buses)

Service 21 duty allocation
Ang Mo Kio
Weekdays (12A-12P / 7S / 2T)
	A/P	SBS3158K, SBS3186D, SBS3847E, SBS3904Z, SBS5023C, SBS6014Y, SBS6624L, SG5116E, SG6222A, SG6223Y, SG6233T & SG6261L
	S	SBS5109P, SBS8280G, SBS8287M, SBS8289H & SBS8816L
	T	SBS8823R & SBS8830U
Saturdays (12A-15P / 1T)
	A/P	SBS5023C, SBS8287M, SBS3186D, SG5116E, SG6222A, SG6223Y, SG6233T & SG6261L
	P	SBS8823R
	T	SBS3158K
Sundays & Public Holidays (8A-10P / 2S / 6T)
	A/P	SBS3158K, SBS6014Y, SBS6624L, SG6222A, SG6223Y, SG6233T & SG6261L
	P	SBS3847E
	S	SG5116E
	T	SBS3186D
Bedok North
Weekdays (7A-6P / 1S)
	A/P	SBS3013U, SBS7668D, SBS8179S, SBS8532E, SBS8662M & SG5023P
	A	SBS8230B
	S	SBS8667A
Saturdays (7A-7P)
	A/P	SBS3013U, SBS7668D, SG5023P & 4 Random DDs
Sundays & Public Holidays (6A-7P)
	A/P	SBS3013U, SBS7668D, SG5023P & 3 Random DDs
	P	Random DD

Route Information

Frequency

Period	AM Peak (First Bus - 08:30)	AM Off Peak (08:31 - 16:59)	PM Peak (17:00 - 19:00)	PM Off Peak (19:01 - Last Bus)
towards St. Michael's	07 - 15 minutes	08 - 16 minutes	11 - 16 minutes	12 - 16 minutes
towards Pasir Ris	10 - 15 minutes	08 - 15 minutes	08 - 17 minutes	12 - 16 minutes

Special Departures

• 82069

  Aft Lor 106 Changi
  Changi Rd
  →
  52499

  St. Michael's Ter
  Whampoa Rd
  • Weekdays: 05:55 (SG5116E) & 06:10 (SBS8179S)
  • Saturdays: 05:55 (SG6233T) & 06:06 (SBS3013U)
  • Sundays & Public Holidays: 05:55 (SBS3158K)
• 80089

  Bef Lor 18 Geylang
  Geylang Rd
  →
  52499

  St. Michael's Ter
  Whampoa Rd
  • Sundays & Public Holidays: 17:51 (SBS3186D), 18:15 & 18:31
• 82061

  Eunos Stn/Int
  Sims Ave
  EW7Eunos →
  77009

  Pasir Ris Int
  Pasir Ris Dr 3
  EW1Pasir Ris
  Pasir Ris Mall
  Pasir Ris Town Park
  Whitesands Mall
  • Weekdays: 05:50 (SG6233T), 06:00 (SG6261L), 06:18 & 06:31

Service 21A

File:SBS6166S 21A.jpeg

SBS6166S on Short-Trip Service 21A

• 80089

  Bef Lor 18 Geylang
  Geylang Rd
  →
  07231

  Bef Tai Hoe Hotel
  Kitchener Rd
  City Square Mall
  Mustafa Centre
  • Sundays & Public Holidays: 16:52 (SBS3186D), 17:11 (DD), 17:22 (DD), 17:42 (DD) & 17:56

Direction 1 (Pasir Ris → St. Michael's)

[Show/Hide Full Route Details]

Bus Stops		Nearby Attraction	Weekdays		Saturdays		Suns / PHs
			First bus	Last bus	First bus	Last bus	First bus	Last bus
77009 Pasir Ris Int(Berth B1) Pasir Ris Dr 3		EW1Pasir Ris Pasir Ris Mall Pasir Ris Town Park Whitesands Mall	EW1Pasir Ris	05:30	00:00	05:30	00:00	05:30	00:00
78109 Downtown East Pasir Ris Dr 3		Downtown East		05:33	00:03	05:33	00:03	05:33	00:03
78081 Blk 467 Pasir Ris Dr 6				05:35	00:05	05:35	00:05	05:34	00:05
78071 Blk 446 Pasir Ris Dr 6				05:37	00:06	05:36	00:06	05:35	00:06
78069 Blk 442 Pasir Ris Dr 1				05:38	00:07	05:37	00:07	05:36	00:07
78031 Blk 191 Pasir Ris St 12				05:39	00:08	05:38	00:08	05:37	00:08
78181 Bef Blk 187 Pasir Ris St 11				05:40	00:08	05:38	00:08	05:37	00:08
78191 Aft Blk 182 Pasir Ris St 11				05:43	00:11	05:41	00:11	05:40	00:11
98099 Blk 269A Pasir Ris Dr 1				05:44	00:12	05:43	00:13	05:42	00:12
98019 Opp Blk 149A Loyang Ave				05:47	00:15	05:45	00:15	05:44	00:15
76249 Blk 370 Tampines Ave 7				05:52	00:19	05:50	00:20	05:49	00:19
76239 Blk 390 Tampines Ave 7				05:53	00:20	05:51	00:21	05:50	00:20
76229 Opp Tampines East Stn Tampines Ave 7		DT33Tampines East	DT33Tampines East	05:54	00:21	05:52	00:22	05:51	00:21
76219 Blk 230E Tampines Ave 7				05:55	00:22	05:53	00:23	05:52	00:21
76209 Blk 233 Tampines Ave 7				05:56	00:23	05:54	00:24	05:53	00:22
76149 Opp Tampines Stn/Int Tampines Ave 4		EW2DT32Tampines Tampines 1	EW2DT32Tampines	05:58	00:24	05:56	00:25	05:54	00:23
76139 Opp Century Sq Tampines Ave 4		EW2DT32Tampines Century Square Tampines Mall		05:59	00:25	05:57	00:26	05:55	00:24
76069 Blk 147 Tampines Ave 5				06:01	00:27	05:59	00:27	05:57	00:26
75059 Bef Tampines West Stn Tampines Ave 1		DT31Tampines West SAFRA Tampines	DT31Tampines West	06:03	00:29	06:01	00:29	05:59	00:28
75069 Blk 960A Bedok Resvr Rd				06:05	00:31	06:03	00:31	06:02	00:30
75349 The Clearwater Condo Bedok Resvr Rd		Bedok Reservoir Park		06:05	00:31	06:03	00:31	06:02	00:30
84609 Waterfront Key Bedok Resvr Rd				06:07	00:33	06:05	00:33	06:04	00:32
84639 Aft Waterfront Waves Bedok Resvr Rd				06:08	00:33	06:06	00:33	06:04	00:32
84619 Waterfront Isle Bedok Resvr Rd				06:09	00:34	06:06	00:34	06:05	00:33
84629 Blk 716 Bedok Resvr Rd				06:10	00:34	06:07	00:34	06:05	00:33
84479 Blk 713 Bedok Resvr Rd				06:11	00:35	06:08	00:35	06:06	00:34
84469 Blk 703 Bedok Resvr Rd				06:12	00:36	06:09	00:36	06:07	00:35
84481 Aft Bedok Ind Pk C Bedok Resvr Rd				06:15	00:38	06:12	00:38	06:09	00:36
84491 Blk 629 Bedok Resvr Rd				06:16	00:39	06:13	00:39	06:10	00:37
72079 Blk 609 Bedok Resvr Rd				06:18	00:40	06:15	00:40	06:11	00:38
72069 Blk 121 Bedok Resvr Rd				06:19	00:41	06:16	00:41	06:12	00:39
72029 Opp Blk 646 Bedok Resvr Rd				06:20	00:42	06:17	00:42	06:13	00:40
72019 Opp Blk 322 Jln Eunos				06:22	00:43	06:19	00:43	06:14	00:41
83119 Opp Blk 16 Jln Eunos				06:25	00:45	06:21	00:45	06:16	00:43
83109 Opp Eunos Stn Jln Eunos		EW7Eunos	EW7Eunos	06:25	00:46	06:22	00:46	06:17	00:43
82069 Aft Lor 106 Changi Changi Rd				05:55	00:48	05:55	00:48	05:55	00:45
82049 Joo Chiat Cplx Changi Rd		Geylang Serai Market		05:57	00:49	05:57	00:50	05:57	00:47
82029 Blk 14 Mkt/FC Geylang Rd				05:58	00:51	05:58	00:51	05:58	00:48
82109 City Plaza Geylang Rd		City Plaza KINEX Paya Lebar Quarter		05:59	00:52	05:59	00:52	05:59	00:49
81069 Opp Lor 39 Geylang Geylang Rd				06:01	00:52	06:00	00:53	06:01	00:50
81049 Aft Lor 34 Geylang Geylang Rd				06:02	00:54	06:01	00:54	06:02	00:51
81029 Aft Lor 28 Geylang Geylang Rd				06:03	00:54	06:02	00:55	06:03	00:52
80089 Bef Lor 18 Geylang Geylang Rd		21A		06:04	00:56	06:04	00:57	06:04	00:54
80069 Opp Mohd Salleh Mque Geylang Rd		21A		06:06	00:57	06:05	00:58	06:06	00:55
80049 Aft Sims Way Geylang Rd		21A		06:08	00:59	06:07	01:00	06:09	00:57
80101 Kallang Stn/Opp Blk 2C Lor 1 Geylang	EW10Kallang	21A	EW10Kallang	06:08	01:00	06:08	01:01	06:08	00:58
60051 Opp Kallang Pl Boon Keng Rd		21A		06:11	01:02	06:11	01:04	06:10	01:01
60099 Bef Lavender St Bendemeer Rd		21A		06:13	01:04	06:13	01:06	06:12	01:03
07329 Hoa Nam Bldg Jln Besar	ARC 380	21A		06:14	01:05	06:14	01:07	06:13	01:04
07231 Bef Tai Hoe Hotel Kitchener Rd	City Square Mall Mustafa Centre	21A		06:16	01:07	06:16	01:09	06:16	01:06
07211 Aft Farrer Pk Stn Exit G S'goon Rd		NE8Farrer Park City Square Mall	NE8Farrer Park	06:18	01:08	06:18	01:11	06:18	01:07
07221 Sri Vadapathira K Tp S'goon Rd				06:19	01:09	06:19	01:12	06:19	01:08
50249 S'pore Khalsa Assn Balestier Rd				06:21	01:11	06:21	01:13	06:21	01:09
50239 S'pore Indian Assn Balestier Rd				06:22	01:11	06:22	01:14	06:22	01:10
50129 Opp Natl Skin Ctr Moulmein Rd		Tan Tock Seng Hospial		06:24	01:13	06:25	01:16	06:25	01:11
50119 St. Joseph Instn Jnr Moulmein Rd				06:26	01:14	06:27	01:17	06:27	01:13
50031 Opp Novena Ch Thomson Rd		NS20Novena	NS20Novena	06:28	01:16	06:27	01:19	06:27	01:14
50041 Novena Lodge Thomson Rd				06:29	01:17	06:28	01:20	06:28	01:15
50161 Bef Jln Dusun Balestier Rd				06:32	01:18	06:30	01:22	06:30	01:16
50171 Zhongshan Mall Balestier Rd		Zhongshan Mall		06:33	01:19	06:32	01:23	06:32	01:17
50191 Bef Balestier Plaza Balestier Rd				06:35	01:20	06:33	01:24	06:33	01:18
50201 Shaw Plaza Balestier Rd		Shaw Plaza		06:36	01:21	06:34	01:24	06:34	01:19
50211 Opp Balestier Pt Balestier Rd				06:37	01:22	06:35	01:25	06:35	01:20
50991 Blk 82 Whampoa Dr				06:38	01:23	06:38	01:27	06:36	01:21
52129 Blk 29 Jln Bahagia		* 21(towards St. Michael's Terminal)		06:40	01:24	06:40	01:28	06:39	01:22
52049 Blk 19 Jln Tenteram		* 21(towards St. Michael's Terminal)		06:41	01:25	06:41	01:29	06:40	01:23
52119 Opp Blk 65 Jln Tenteram		* 21(towards St. Michael's Terminal)		06:43	01:27	06:43	01:31	06:42	01:25
52499 St. Michael's Ter(Berth B1) Whampoa Rd				06:45	01:28	06:46	01:32	06:42	01:26

^* Do check the direction of the bus as both directions stop at this bus stop.

Direction 2 (St. Michael's → Pasir Ris)

[Show/Hide Full Route Details]

Bus Stops	Nearby Attraction	Weekdays		Saturdays		Suns / PHs
		First bus	Last bus	First bus	Last bus	First bus	Last bus
52499 St. Michael's Ter(Berth B1) Whampoa Rd			05:30	00:00	05:30	00:00	05:30	00:00
52451 Blk 114 Whampoa Rd			05:31	00:01	05:31	00:01	05:31	00:01
52129 Blk 29 Jln Bahagia	* 21(towards Pasir Ris Interchange)		05:32	00:02	05:32	00:02	05:32	00:02
52049 Blk 19 Jln Tenteram	* 21(towards Pasir Ris Interchange)		05:33	00:03	05:33	00:03	05:33	00:03
52119 Opp Blk 65 Jln Tenteram	* 21(towards Pasir Ris Interchange)		05:35	00:04	05:35	00:05	05:35	00:05
52099 Opp NKF Kim Keat Rd			05:36	00:05	05:36	00:06	05:36	00:06
50159 Bef Kim Keat Lane Kim Keat Rd			05:37	00:06	05:37	00:07	05:37	00:07
50209 Aft Pegu Rd Balestier Rd			05:38	00:07	05:38	00:08	05:38	00:08
50199 Opp Shaw Plaza Balestier Rd	Shaw Plaza		05:38	00:07	05:39	00:08	05:39	00:08
50189 Opp Public Mansion Balestier Rd			05:39	00:08	05:40	00:09	05:40	00:09
50179 Opp Zhongshan Mall Balestier Rd	Zhongshan Mall		05:40	00:09	05:41	00:10	05:41	00:00
50169 Aft Irrawaddy Rd Balestier Rd			05:41	00:10	05:42	00:11	05:42	00:11
50059 Opp Thomson Med Ctr Thomson Rd			05:43	00:12	05:43	00:13	05:43	00:13
50049 Opp Novena Lodge Thomson Rd			05:43	00:12	05:44	00:13	05:44	00:13
50038 Novena Stn Thomson Rd	NS20Novena Velocity @ Novena Square Tan Tock Seng Hospital	NS20Novena	05:45	00:14	05:46	00:14	05:46	00:15
50111 Revival Ctr Ch Moulmein Rd			05:47	00:15	05:47	00:16	05:47	00:16
50121 Natl Skin Ctr Moulmein Rd	Tan Tock Seng Hospial		05:48	00:16	05:49	00:17	05:49	00:17
50231 NorthLight Sch Balestier Rd			05:50	00:18	05:51	00:19	05:51	00:19
50331 Blk 122 Mcnair Rd			05:52	00:19	05:52	00:20	05:52	00:20
50349 Blk 107 Towner Rd			05:53	00:19	05:53	00:21	05:53	00:21
60199 Boon Keng Stn/Blk 22 Boon Keng Rd	NE9Boon Keng	NE9Boon Keng	05:54	00:20	05:54	00:22	05:54	00:22
60059 Bef Kallang Pl Boon Keng Rd			05:56	00:22	05:56	00:24	05:56	00:24
80109 Opp Kallang Stn/Blk 2C Lor 1 Geylang	EW10Kallang	EW10Kallang	05:59	00:24	05:59	00:26	05:59	00:26
80051 Aft Lor 1 Geylang Sims Ave			06:00	00:25	06:00	00:27	06:00	00:27
80071 Yi Xiu Fty Bldg Sims Ave			06:02	00:27	06:01	00:29	06:01	00:29
80091 Bef Lor 23 Geylang Sims Ave			06:07	00:30	06:05	00:32	06:06	00:32
81011 Aft Aljunied Stn Sims Ave	EW9Aljunied	EW9Aljunied	06:05	00:29	06:04	00:31	06:04	00:31
81031 Blk 134 Sims Ave			06:06	00:30	06:05	00:32	06:05	00:32
81051 Sims Ville Sims Ave			06:08	00:32	06:06	00:34	06:07	00:34
82011 Aft Paya Lebar Quarter Sims Ave	EW8CC9Paya Lebar Paya Lebar Quarter Singpost Centre	EW8CC9Paya Lebar	06:10	00:33	06:08	00:35	06:09	00:35
82032 Blk 416 Sims Ave	Geylang Serai Market		06:11	00:34	06:09	00:36	06:10	00:36
82061 Eunos Stn/Int Sims Ave	EW7Eunos	EW7Eunos	05:50	00:36	06:11	00:38	06:12	00:38
83101 Eunos Stn Jln Eunos	EW7Eunos		05:52	00:38	06:13	00:39	06:14	00:39
83111 Blk 17 Jln Eunos			05:53	00:39	06:14	00:40	06:15	00:40
72011 Blk 322 Jln Eunos			05:55	00:41	06:16	00:42	06:17	00:42
72021 Blk 646 Bedok Resvr Rd			05:57	00:42	06:17	00:43	06:19	00:43
72061 Blk 122 Bedok Resvr Rd			05:58	00:44	06:19	00:45	06:21	00:45
72071 Blk 133 Bedok Resvr Rd			05:59	00:45	06:20	00:46	06:22	00:46
84499 Blk 140 Bedok Resvr Rd			06:01	00:46	06:21	00:47	06:23	00:47
84489 Opp Bedok Ind Pk C Bedok Resvr Rd			06:03	00:48	06:23	00:49	06:25	00:49
84461 Opp Blk 701 Bedok Resvr Rd			06:05	00:50	06:24	00:50	06:27	00:50
84471 Blk 745 Bedok Resvr Rd			06:06	00:51	06:25	00:51	06:28	00:51
84621 Opp Blk 716 Bedok Resvr Rd			06:07	00:52	06:26	00:52	06:29	00:52
84611 Opp Waterfront Isle Bedok Resvr Rd			06:09	00:53	06:27	00:53	06:30	00:53
84631 Opp Waterfront Waves Bedok Resvr Rd			06:09	00:54	06:28	00:54	06:31	00:54
84601 Opp Waterfront Key Bedok Resvr Rd			06:10	00:54	06:28	00:54	06:31	00:54
75341 Opp The Clearwater Condo Bedok Resvr Rd	Bedok Reservoir Park		06:11	00:55	06:30	00:55	06:33	00:56
75061 Blk 954D Bedok Resvr Rd			06:13	00:56	06:31	00:56	06:34	00:57
75051 Tampines West Stn Exit B Tampines Ave 1	DT31Tampines West SAFRA Tampines	DT31Tampines West	06:14	00:58	06:33	00:58	06:36	00:59
76061 Blk 938 Tampines Ave 5			06:16	01:00	06:35	01:00	06:38	01:01
76131 UOB Tampines Ctr Tampines Ave 4	EW2DT32Tampines Century Square Tampines Mall		06:18	01:01	06:37	01:01	06:40	01:03
76141 Tampines Stn/Int Tampines Ave 4	EW2DT32Tampines Tampines 1	EW2DT32Tampines	06:20	01:02	06:38	01:02	06:41	01:04
76201 Blk 423 Tampines Ave 7			06:23	01:04	06:40	01:04	06:43	01:06
76211 Blk 449 Tampines Ave 7			06:25	01:05	06:41	01:05	06:44	01:07
76221 Tampines East Stn Exit A Tampines Ave 7	DT33Tampines East	DT33Tampines East	06:26	01:06	06:42	01:06	06:45	01:08
76231 Opp Blk 390 Tampines Ave 7			06:29	01:08	06:44	01:08	06:46	01:09
76241 Blk 497D Tampines Ave 7			06:29	01:09	06:45	01:09	06:47	01:10
98011 Blk 149A Loyang Ave			06:32	01:12	06:48	01:12	06:50	01:13
98091 Blk 156 Pasir Ris Dr 1			06:34	01:14	06:50	01:13	06:51	01:14
78199 Opp White Sands Pr Sch Pasir Ris St 11			06:36	01:15	06:51	01:15	06:53	01:16
78189 Opp Blk 187 Pasir Ris St 11			06:38	01:17	06:53	01:16	06:54	01:17
78039 Blk 104 Pasir Ris St 12			06:39	01:17	06:53	01:17	06:55	01:18
78061 Blk 104 Pasir Ris Dr 1			06:39	01:18	06:54	01:17	06:55	01:18
78079 Blk 429 Pasir Ris Dr 6			06:41	01:20	06:56	01:18	06:56	01:19
78089 Blk 405 Pasir Ris Dr 6			06:44	01:22	06:58	01:20	06:58	01:21
78101 Opp Downtown East Pasir Ris Dr 3	Downtown East		06:46	01:24	07:00	01:22	07:00	01:23
77009 Pasir Ris Int(Alighting) Pasir Ris Dr 3	EW1Pasir Ris Pasir Ris Mall Pasir Ris Town Park Whitesands Mall	EW1Pasir Ris	06:50	01:27	07:03	01:25	07:03	01:26

^* Do check the direction of the bus as both directions stop at this bus stop.

Historical Information

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	Pasir Ris ↔ Lor 1 Geylang	1992	29 November	Introduced between Pasir Ris Int and Lor 1 Geylang Ter under TransitLink Network Integration Exercise Phase 10.
	Pasir Ris ↔ St. Michael's	1993	23 May	Integrated with Service 4 and extended to St Michael's Ter under TransitLink Network Integration Exercise Phase 13.
		1994	TBC	Skips the bus stop outside Kallang Stn along Sims Ave.
		1999	TBC	Serves new pair of bus stops outside and opposite The Clearwater Condo along Bedok Reservoir Rd.
		2001	18 February	Serves new staggered bus stop outside Novena Stn along Thomson Rd, skipping the bus stop outside Novena Ch.
		2002	TBC	Serves new pair of bus stops opposite and between Blks 731 and 734 along Bedok Reservoir Rd.
		2003	21 June	Amended to ply Bendemeer Rd, Jln Besar, Kitchener Rd and Serangoon Rd under North East Line Rationalisation Phase 1.
		2004	27 April	Amended to ply Geylang Rd, Kallang Rd and Sims Ave towards St. Michael's Ter with the temporary conversion of Lor 1 Geylang to one-way traffic.
			6 December	Amended to ply the reinstated Lor 1 Geylang towards St. Michael's Ter, skipping Geylang Rd, Kallang Rd and Sims Ave.
		2006	26 June	Designated wheelchair-accessible bus service (WAB).
	21Pasir Ris ↔ St. Michael's 21AGeylang Rd → Kitchener Rd	2014	25 May	21AIntroduced from Geylang Rd (Bef Lor 18 Geylang) to Kitchener Rd (Bef Tai Hoe Hotel) on Sundays and Public Holidays. Wheelchair-accessible bus service (WAB) at launch.
		2016	24 April	Amended to ply Jln Tenteram in both directions.
		2022	30 October	Temporarily amended to ply Pasir Ris St 11 and Pasir Ris St 12 with the partial closure of Pasir Ris Dr 1 to facilitate the construction of CR4Pasir Ris East station on the Cross Island Line.